Navigation

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Basic Navigation for the Beginner (Pub. No. 5193)

by Elbert Robberson

"Navigation? Who needs it! I've just got a small boat, and I'm just going to splash around the bay. I'll be in sight of land the whole time." Then a squall makes up, or fog drops a curtain all around. Sure, you know where land is--but exactly which directions should you steer to get there? And how about those rocks along the shore? . . . .Anyone operating a boat, no matter what its size, needs to know some navigation--must be able to determine position and plto the course and time toa  desitnation. Fortunately, anyone can do this. With or without the help of a nautical almanac or a sextant, fog or no fog. Here--minus the trapping of astronomy, azimuths and hyperbolic functions--is all thenavigation you need to know.

20 pages

$8.95
Make the Rabl Simplified Sextant (Pub. No. 5196)

With this easily constructed instrument you can learn the fundamentals of navigation

by Sam Rabl

When an article on shooting the sun and stars with a sextant appeared in the last edition of How to build 20 Boats, many of our readers became interested in the sextand and its use. The instrument has many uses other than navigation, and while the regular dextant is beyond the capabilities of the home workshop, the one described here will do most of the proefessional sextant's tricks. It is made from very ordinary materials, most of which can be found around the home.

12 pages

$7.95
Finding One's Way at Sea (Pub. No. 5509)

by Jack London

reprinted from Harper's Weekly (ca. 1920)

The "Snark" started on her long voyage without a navigator. We beat out through the Golden Gate on April 23, and headed for the Hawaiian Islands, twenty-one hundred sea miles away as the sea-gull flies. And the outcome was our justification. We arrived. And we arrived, you shall see . . . that is, without any trouble to amount to anything.

8 pages

$6.95
How to Make a Sextant (Pub. No. 5572)

From everyday materials. Two designs by W.E. Partridge and Sam Rabl

From the Partridge Article: "Owing to the increase of offshore racing and cruising the practice of navigation has begun to interest numbers of yachtsmen, and the study of the art is becoming a popular form of amusement. But in order to thoroughly study the art, it is necessary to have certain tools, the chief of which being what is called a sextant or  quadrant, an instrument employed to measure angles. The whole science of navigation is based upon the measurement of angles. But unfortunately these instruments are, owing to delicacy of construction, extremely expensive, especially in the United States, where their manufacture is heavily taxed. This prevents the average young yachtsman from having one. Had he such an instrument he would soon become familiar with its use and find the employment of it giving added pleasure to his voyaging. It is impossible to make a cheap sextant that can be relied upon to give accurate service under all conditions, especially if the frame is of wood, as the expansion and contraction of the material will affect the reading of the arc to the extent of several minutes, if not degrees. And it is not to be expected that one built from these plans will successfully compete with a Kew certificate machine, but by making and using it, you will thoroughly learn what a sextant is  and how it is employed. " Includes full-size plate for vernier.

58 pages, 1 plate(s)

$14.95
Hoke Method in Practice, The (Pub. No. 5877)

by Lieut. Commander H.G Hemingway, U.S.C.G.

A useful method of compass adjustment.

14 pages

$7.95
Building a Shadow Pelorus and Compensating Compass (Pub. No. 7772)

Compass compensating aboard a boat is performed by running reciprocal courses. With the compass on a book that was rotated 180 degrees on the table, you were, in effect, running reciprocal courses indoors. To run a reciprocal course on the water, you reverse your boat’s heading by 180 degrees so that if you were originally heading north, your reciprocal course will be south. Here's how to use a home-made Shadow Pelorus to help you do this accurately.

4 page(s)

$3.50
Compensating the Compass at Home (Pub. No. 7788)

No one is perfect and that applies to compass readings as well as to the people who take them. Often, compass error is not so much the fault of the instrument as it is the “company” it keeps—tachometer, radio, and depth sounder, to say nothing of a screwdriver, pliers, and other ferrous metal objects carelessly placed nearby. These and other things can cause deviation errors because they cause the compass to stray from a true magnetic reading. A classic example of this type of error, or deviation, is the deer hunter who checked his hand compass without laying his rifle aside. At the end of the day, he discovered he had been traveling in a circle. Electrical wiring near a compass also can create problems, especially if it is a single wire with direct current flowing through it. Twisting single wire circuits around one another will cancel out these interfering magnetic fields and help avoid this type of compass error. Everyone knows that north is at the North Pole, geographically speaking. Navigators refer to this direction as true north. But there also is the magnetic North Pole. A compass in good working condition will indicate the magnetic North Pole, unless there are shipboard magnetic disturbances to cause it to deviate. Before you install the compass on your boat, you can check its operation indoors.

2 page(s)

$3.50
Elements of Navigation for the Beginner (Pub. No. 7839)

by John Farr

Generally when the subject of navigation is broached to most small boat owners, they conjure a vision of complicated instruments, complicated tables and a picture of the navigator as a super-human mathematician to whom Einstein is a rank amateur. There need be no fear on the subject of higher education being necessary to understand how to get around on the sea and know at all times just where you are, when you consider the fact that very few of the captains in command of the world’s steamers today had any higher than a high school education. The most complicated problem in navigation uses mathematics no higher than trigonometry, and most of the problems can be worked with simple addition and subtraction. In fact, all the problems necessary for small boat navigation may be solved by the latter method.

4 page(s)

$3.50
Shooting Sun and Stars with a Sextant (Pub. No. 7920)

by Sam Rabl

Why get lost? Navigation is really easy to learn and will make you a real sailor.

Generally, when the subject of navigation is broached to most small boat owners, they conjure a vision of complicated instruments, complicated tables and a picture of the navigator as a super-human mathematician to whom Einstein is a rank amateur. There need be no fear on the subject of higher education being necessary to understand how to get around on the sea and know at all times just where you are, when you consider the fact that very few of the captains in command of the world’s steamers today had any higher than a high school education. The most complicated problem in navigation uses mathematics no higher than trigonometry, and most of the problems can be worked with simple addition and substraction. In fact, all the problems necessary for small boat navigation may be solved by the latter method.

4 page(s)

$3.50
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